Harold Laski was a writer who exercised enormous influence in the turbulent environment of the early to mid-twentieth century. Though normally regarded as a political theorist, Laski frequently wrote on the problems of international politics. Certainly, his work was fully engaged with world issues in the inter-war and post-war periods. Like many critical and idealist thinkers of the time, he initially hoped that the League of Nations would usher in a new, international democratic system. However his early hopes gave way to a more pessimistic (and more radical) perspective, and from the late 1920s onwards he believed that the only way of transcending the existing system of sovereign states was by moving beyond capitalism. Combining a critique of both the Westphalian system and the market which he assumed underpinned it, Laski raised major questions – relevant to his own times and to ours too. Mainly ignored since his death, it is perhaps time that the work of this unduly neglected figure should be revisited.